Value is too difficult to be accurate without seeing the gun. Condition which includes the amount of original finish and original configuration will determine value. Recommend taking it to a gun shop for appraisal.
Not in the open market
Impossible to answer without a serial number and detailed description.
Fabrique Nationale (the name of the company) arms of war, Herstal, Belguim (place of manufacture. Brownings patent filed.
Yes
Depends on your pocketbook.
100-1000+ depending on specifics
This is an Auto-5 Shotgun
Yes, but not easy to find.
100-1000 depending on the specifics
If you have the FN 1900, also called the Browning #1, it was produced from 1899-1907 and there were 700,000 made. It will have "Fabrique Nationale-Herstal-Belgique (Brownings Patent)" inascribed on the left side of the pistol. Under that it will have Fabrique Nationale's icon with a small picture of a pistol and a circle around it. Under that it will have " BREVETE-S.G.D.G." which is a french term for the patent process. It was used on many things including clocks. Hope this helps.
Can't be answered without a detailed description of all markings, type of action, finish, barrel length, condition, accessories, box, papers, etc..
Can you give us the model of the rifle? The letter "n" could not be used to identify the model. More info is needed.